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 <span id="projectnumber">2.10.3</span>
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<li class="navelem"><a class="el" href="namespacesigc.html">sigc</a></li><li class="navelem"><a class="el" href="structsigc_1_1connection.html">connection</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<a href="structsigc_1_1connection-members.html">List of all members</a> </div>
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<div class="headertitle">
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<div class="title">sigc::connection Struct Reference<div class="ingroups"><a class="el" href="group__signal.html">Signals</a></div></div> </div>
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</div><!--header-->
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<div class="contents">
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<p>Convinience class for safe disconnection.
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<a href="structsigc_1_1connection.html#details">More...</a></p>
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<p><code>#include <sigc++/connection.h></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a95f80dbbf10fde0b851d78ec12cc2629"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a95f80dbbf10fde0b851d78ec12cc2629">connection</a> () noexcept</td></tr>
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<tr class="memdesc:a95f80dbbf10fde0b851d78ec12cc2629"><td class="mdescLeft"> </td><td class="mdescRight">Constructs an empty connection object. <a href="#a95f80dbbf10fde0b851d78ec12cc2629">More...</a><br /></td></tr>
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<tr class="separator:a95f80dbbf10fde0b851d78ec12cc2629"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad13d5e3331cc9b1494e0edb8fa37fdba"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#ad13d5e3331cc9b1494e0edb8fa37fdba">connection</a> (const <a class="el" href="structsigc_1_1connection.html">connection</a>& c)</td></tr>
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<tr class="memdesc:ad13d5e3331cc9b1494e0edb8fa37fdba"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a connection object copying an existing one. <a href="#ad13d5e3331cc9b1494e0edb8fa37fdba">More...</a><br /></td></tr>
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<tr class="separator:ad13d5e3331cc9b1494e0edb8fa37fdba"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac8847ae94e0b05bed6c81f54f58deef3"><td class="memTemplParams" colspan="2">template<typename T_slot > </td></tr>
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<tr class="memitem:ac8847ae94e0b05bed6c81f54f58deef3"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#ac8847ae94e0b05bed6c81f54f58deef3">connection</a> (const <a class="el" href="structsigc_1_1slot__iterator.html">slot_iterator</a>< T_slot >& it)</td></tr>
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<tr class="memdesc:ac8847ae94e0b05bed6c81f54f58deef3"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a connection object from a slot list iterator. <a href="#ac8847ae94e0b05bed6c81f54f58deef3">More...</a><br /></td></tr>
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<tr class="separator:ac8847ae94e0b05bed6c81f54f58deef3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a124709de26781e5ffcf8bbb5dcd621ed"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a124709de26781e5ffcf8bbb5dcd621ed">connection</a> (<a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& sl)</td></tr>
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<tr class="memdesc:a124709de26781e5ffcf8bbb5dcd621ed"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a connection object from a slot object. <a href="#a124709de26781e5ffcf8bbb5dcd621ed">More...</a><br /></td></tr>
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<tr class="separator:a124709de26781e5ffcf8bbb5dcd621ed"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a99678ccb2be5c20719f37e469416578a"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a99678ccb2be5c20719f37e469416578a">~connection</a> ()</td></tr>
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<tr class="separator:a99678ccb2be5c20719f37e469416578a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a581ae4f2b708cb6be7b081557864d6ec"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a581ae4f2b708cb6be7b081557864d6ec">block</a> (bool should_block=true) noexcept</td></tr>
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<tr class="memdesc:a581ae4f2b708cb6be7b081557864d6ec"><td class="mdescLeft"> </td><td class="mdescRight">Sets or unsets the blocking state of this connection. <a href="#a581ae4f2b708cb6be7b081557864d6ec">More...</a><br /></td></tr>
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<tr class="separator:a581ae4f2b708cb6be7b081557864d6ec"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1deb741a4ba40a14b035b672c3511ed0"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a1deb741a4ba40a14b035b672c3511ed0">blocked</a> () const noexcept</td></tr>
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<tr class="memdesc:a1deb741a4ba40a14b035b672c3511ed0"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the connection is blocked. <a href="#a1deb741a4ba40a14b035b672c3511ed0">More...</a><br /></td></tr>
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<tr class="separator:a1deb741a4ba40a14b035b672c3511ed0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab58593c245ee98d29f1f5871c646b900"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#ab58593c245ee98d29f1f5871c646b900">connected</a> () const noexcept</td></tr>
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<tr class="memdesc:ab58593c245ee98d29f1f5871c646b900"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the connection is still active. <a href="#ab58593c245ee98d29f1f5871c646b900">More...</a><br /></td></tr>
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<tr class="separator:ab58593c245ee98d29f1f5871c646b900"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0452bd182a61650d14a9664d6297ed1b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a0452bd182a61650d14a9664d6297ed1b">disconnect</a> ()</td></tr>
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<tr class="memdesc:a0452bd182a61650d14a9664d6297ed1b"><td class="mdescLeft"> </td><td class="mdescRight">Disconnects the referred slot. <a href="#a0452bd182a61650d14a9664d6297ed1b">More...</a><br /></td></tr>
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<tr class="separator:a0452bd182a61650d14a9664d6297ed1b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aff09a1d78cf49f011c6eea8ce63ba765"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#aff09a1d78cf49f011c6eea8ce63ba765">empty</a> () const noexcept</td></tr>
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<tr class="memdesc:aff09a1d78cf49f011c6eea8ce63ba765"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the connection is still active. <a href="#aff09a1d78cf49f011c6eea8ce63ba765">More...</a><br /></td></tr>
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<tr class="separator:aff09a1d78cf49f011c6eea8ce63ba765"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a93215e1ea86c5fd0a465b2c4dba1257e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a93215e1ea86c5fd0a465b2c4dba1257e">operator bool</a> () noexcept</td></tr>
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<tr class="memdesc:a93215e1ea86c5fd0a465b2c4dba1257e"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the connection is still active. <a href="#a93215e1ea86c5fd0a465b2c4dba1257e">More...</a><br /></td></tr>
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<tr class="separator:a93215e1ea86c5fd0a465b2c4dba1257e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a016094b53bafdc9ce593febb68cb00a5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structsigc_1_1connection.html">connection</a>& </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a016094b53bafdc9ce593febb68cb00a5">operator=</a> (const <a class="el" href="structsigc_1_1connection.html">connection</a>& c)</td></tr>
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<tr class="memdesc:a016094b53bafdc9ce593febb68cb00a5"><td class="mdescLeft"> </td><td class="mdescRight">Overrides this connection object copying another one. <a href="#a016094b53bafdc9ce593febb68cb00a5">More...</a><br /></td></tr>
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<tr class="separator:a016094b53bafdc9ce593febb68cb00a5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:adee4ffd4b1669b4726fd9afc36330c14"><td class="memTemplParams" colspan="2">template<typename T_slot > </td></tr>
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<tr class="memitem:adee4ffd4b1669b4726fd9afc36330c14"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="structsigc_1_1connection.html">connection</a>& </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#adee4ffd4b1669b4726fd9afc36330c14">operator=</a> (const <a class="el" href="structsigc_1_1slot__iterator.html">slot_iterator</a>< T_slot >& it)</td></tr>
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<tr class="memdesc:adee4ffd4b1669b4726fd9afc36330c14"><td class="mdescLeft"> </td><td class="mdescRight">Overrides this connection object with another slot list iterator. <a href="#adee4ffd4b1669b4726fd9afc36330c14">More...</a><br /></td></tr>
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<tr class="separator:adee4ffd4b1669b4726fd9afc36330c14"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a15abcbfa76f1e5d8601cf4ad4176ed50"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#a15abcbfa76f1e5d8601cf4ad4176ed50">unblock</a> () noexcept</td></tr>
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<tr class="memdesc:a15abcbfa76f1e5d8601cf4ad4176ed50"><td class="mdescLeft"> </td><td class="mdescRight">Unsets the blocking state of this connection. <a href="#a15abcbfa76f1e5d8601cf4ad4176ed50">More...</a><br /></td></tr>
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<tr class="separator:a15abcbfa76f1e5d8601cf4ad4176ed50"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:ad45fe90d68fe295e76e130b070e97070"><td class="memItemLeft" align="right" valign="top">static void* </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1connection.html#ad45fe90d68fe295e76e130b070e97070">notify</a> (void* data)</td></tr>
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<tr class="memdesc:ad45fe90d68fe295e76e130b070e97070"><td class="mdescLeft"> </td><td class="mdescRight">Callback that is executed when the referred slot is destroyed. <a href="#ad45fe90d68fe295e76e130b070e97070">More...</a><br /></td></tr>
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<tr class="separator:ad45fe90d68fe295e76e130b070e97070"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Convinience class for safe disconnection. </p>
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<p>Iterators must not be used beyond the lifetime of the list they work on. A connection object can be created from a slot list iterator and may safely be used to disconnect the referred slot at any time (<a class="el" href="structsigc_1_1connection.html#a0452bd182a61650d14a9664d6297ed1b" title="Disconnects the referred slot. ">disconnect()</a>). If the slot has already been destroyed, <a class="el" href="structsigc_1_1connection.html#a0452bd182a61650d14a9664d6297ed1b" title="Disconnects the referred slot. ">disconnect()</a> does nothing. <a class="el" href="structsigc_1_1connection.html#aff09a1d78cf49f011c6eea8ce63ba765" title="Returns whether the connection is still active. ">empty()</a> or operator bool() can be used to test whether the connection is still active. The connection can be blocked (<a class="el" href="structsigc_1_1connection.html#a581ae4f2b708cb6be7b081557864d6ec" title="Sets or unsets the blocking state of this connection. ">block()</a>, <a class="el" href="structsigc_1_1connection.html#a15abcbfa76f1e5d8601cf4ad4176ed50" title="Unsets the blocking state of this connection. ">unblock()</a>).</p>
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<p>This is possible because the connection object gets notified when the referred slot dies (<a class="el" href="structsigc_1_1connection.html#ad45fe90d68fe295e76e130b070e97070" title="Callback that is executed when the referred slot is destroyed. ">notify()</a>). </p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">sigc::connection::connection </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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<p>Constructs an empty connection object. </p>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structsigc_1_1connection.html">connection</a>& </td>
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<td class="paramname"><em>c</em></td><td>)</td>
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<p>Constructs a connection object copying an existing one. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">c</td><td>The connection object to make a copy from. </td></tr>
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template <typename T_slot > </div>
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<td class="memname">sigc::connection::connection </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structsigc_1_1slot__iterator.html">slot_iterator</a>< T_slot >& </td>
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<td class="paramname"><em>it</em></td><td>)</td>
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<p>Constructs a connection object from a slot list iterator. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">it</td><td>The slot list iterator to take the slot from. </td></tr>
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<td class="memname">sigc::connection::connection </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& </td>
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<td class="paramname"><em>sl</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">explicit</span></span> </td>
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<p>Constructs a connection object from a slot object. </p>
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<p>This is only useful if you create your own slot list. </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">sl</td><td>The slot to operate on. </td></tr>
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<td class="memname">sigc::connection::~connection </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">bool sigc::connection::block </td>
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<td>(</td>
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<td class="paramtype">bool </td>
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<td class="paramname"><em>should_block</em> = <code>true</code></td><td>)</td>
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<td></td>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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<p>Sets or unsets the blocking state of this connection. </p>
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<p>See <a class="el" href="classsigc_1_1slot__base.html#a657a8473164c963a5ca4828c88121bb9" title="Sets the blocking state. ">slot_base::block()</a> for details. </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">should_block</td><td>Indicates whether the blocking state should be set or unset. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the connection has been in blocking state before. </dd></dl>
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<td class="memname">bool sigc::connection::blocked </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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</div><div class="memdoc">
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<p>Returns whether the connection is blocked. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the connection is blocked. </dd></dl>
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<td class="memname">bool sigc::connection::connected </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Returns whether the connection is still active. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the connection is still active. </dd></dl>
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</div>
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<td class="memname">void sigc::connection::disconnect </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</div><div class="memdoc">
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<p>Disconnects the referred slot. </p>
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<td class="memname">bool sigc::connection::empty </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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</tr>
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</td>
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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<p>Returns whether the connection is still active. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>false</code> if the connection is still active. </dd></dl>
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<td class="memname">static void* sigc::connection::notify </td>
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<td>(</td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>data</em></td><td>)</td>
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<td></td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Callback that is executed when the referred slot is destroyed. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">data</td><td>The connection object notified (<code>this</code>). </td></tr>
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</table>
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</dd>
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</dl>
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<td class="memname">sigc::connection::operator bool </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">explicit</span><span class="mlabel">noexcept</span></span> </td>
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<p>Returns whether the connection is still active. </p>
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<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the connection is still active. </dd></dl>
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<td class="memname"><a class="el" href="structsigc_1_1connection.html">connection</a>& sigc::connection::operator= </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structsigc_1_1connection.html">connection</a>& </td>
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<td class="paramname"><em>c</em></td><td>)</td>
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<p>Overrides this connection object copying another one. </p>
|
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<dl class="params"><dt>Parameters</dt><dd>
|
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<table class="params">
|
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<tr><td class="paramname">c</td><td>The connection object to make a copy from. </td></tr>
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</table>
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</dd>
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</dl>
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template <typename T_slot > </div>
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<td class="memname"><a class="el" href="structsigc_1_1connection.html">connection</a>& sigc::connection::operator= </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structsigc_1_1slot__iterator.html">slot_iterator</a>< T_slot >& </td>
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<td class="paramname"><em>it</em></td><td>)</td>
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<td></td>
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<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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</div><div class="memdoc">
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<p>Overrides this connection object with another slot list iterator. </p>
|
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<dl class="params"><dt>Parameters</dt><dd>
|
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<table class="params">
|
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<tr><td class="paramname">it</td><td>The new slot list iterator to take the slot from. </td></tr>
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<td class="memname">bool sigc::connection::unblock </td>
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<td>(</td>
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<p>Unsets the blocking state of this connection. </p>
|
|
<dl class="section return"><dt>Returns</dt><dd><code>true</code> if the connection has been in blocking state before. </dd></dl>
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</div>
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</div>
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